有機發光二極體因其擁有較快的響應時間、視角更寬廣、低功率消耗和更高對比、高亮度的影像，所以成為現今的熱門研究主題。其中更因其可撓性，使得OLED和PLED的發展越來越受到重視，尤以PLED容易發展大面積尺寸的優點為甚。所以本實驗室的重點即在於應用主動式矩陣驅動PLED，所以提升OTFT的場效載子移動率(mobility)，提高元件的響應頻率和降低漏電，提升元件開關比(on/off ratio)，延長PLED發光的時間，即為我們努力的方向。

我們的絕緣層是送長的APCVD/PECVD，我們利用polymer如PMMA (poly(methylmethacrylate))和PVP(Polyvinylphenol)來填補因成長oxide過程中出現的缺陷來降低經由閘極的漏電流。在後段處理方面，我們先利用文獻上的方法，N2 annealing和NH3處理因為P3HT摻雜所引起的漏電流。接著我們探討HMDS和介面對於漏電的影響，分析手套箱的水氧值、光的照射、加熱以及抽真空的與否和漏電的關係，最後利用Passivation(PEGDE/Al)覆蓋主動區的方式來隔絕水氧。我們的最好實驗結果是場效載子移動率在0.1cm2V-1s-1的時候，電流開關比達到了104，使元件更進一步達到應用的需求。

Organic light-emitting diodes (OLED) possess many advantages, such as faster response time, more broad of the visual angle, lower power consumption, higher contrast ratio and higher brightness. Among them, because of its flexibility, the developments of OLED and PLED are more and more important. The research of our laboratory is that using active matrix drive PLED, so improving the mobility of OTFT and reducing leakage current to improve on/off ratio is studied.

Our insulator is APCVD/PECVD oxide. We make up the defect which grow up with oxide to reduce the gate leakage current by using polymer like PMMA (poly (methylmethacrylate )) and PVP (Polyvinylphenol ). Then we use N2 annealing and NH3 treatment to deal with the leakage current by P3HT doping. We also discuss the influence of HMDS and interface to the leakage current, and analyze the relationship between leakage current and the water/oxygen value in glove box, lighting, heating and vacuuming. Finally, we cover the active area to prevent water/oxygen by using passivation. Our best result is that sample mobility achieve 0.1cm2V-1s-1 order and the on/off ratio up to 104.

【1】 A. Facchetti *, M.-H. Yoon, T. J. Marks * “Gate Dielectrics for Organic Field-Effect Transistors: New Opportunities for Organic Electronics”. Adv. Mater. 1705 17 (2005)
【2】 S. Richtera,*, M. Ploetnera, W.-J. Fischera, M. Schneiderb, P.-T. guyenb,W. Pliethb, N. Kiriyc, H.-J.P. Adler, “Development of organic thin film transistors based on flexible substrates ” . Thin Solid Films. 140-147, 477 (2005)
【3】 Xu MS, Nakamura M, Sakai M, et al. “High-performance bottom-contact organic thin-film transistors with controlled molecule-crystal/electrode interface” ADVANCED MATERIALS 19 (3): 371+ FEB 5 2007
【4】 E. J. Meijer, C. Detcheverry, P. J. Baesjou, E. van Veenendaal, D. M. de Leeuw, T. M. Klapwijk “Dopant density determination in disordered organic field-effect transistors” J. Appl. Phys. 93, 4831 (2003)
【5】 Satoshi Hoshino, Manabu Yoshida, Sei Uemura, Takehito Kodzasa, Noriyuki Takada, Toshihide Kamata, and Kiyoshi Yase “Influence of moisture on device characteristics of polythiophene-based field-effect transistors ” J. Appl. Phys. 95, 5088 (2004)
【6】 Susmita Pal, Arun K. Nandi “Cocrystallization Mechanism of Poly(3-hexylthiophenes) with Different Amount of Chain Regioregularity” Journal of Applied Polymer Science .3811-3820 , 6 , 101, (2006)
【7】 H. Sirringhaus, P. J. Brown, R. H. Friend, M. M. Nielsen, K. Bechgaard, B. M. W. Langeveld-Voss, A. J. H. Spiering, R. A. J. Janssen, E.W. Meijer, P. Herwig, D. M. de Leeuw “Two-dimensional charge transport in self-organized, high-mobility conjugated polymers” Nature 401, 685 (1999)
【8】 H. Sirringhaus, P. J. Brown, R. H. Friend, M. M. Nielsen, K. Bechgaard, B. M. W. Langeveld-Voss, A. J. H. Spiering, R. A. J. Janssen, E. W. Meijer “Microstructure-mobility correlation in self-organised, conjugated polymer field-effect transistors ” Synth. Met. 111–112, 129 (2000)
【9】 D. H. Kim, Y. D. Park, Y. Jang, H. Yang, Y. H. Kim, J. I. Han, D. G. Moon, S. Park, T. Chang, C. Chang, M. Joo, C. Y. Ryu, K. Cho ” Enhancement of Field-Effect Mobility Due to Surface-Mediated Molecular Ordering in Regioregular Polythiophene Thin Film Transistors” Advanced Functional Materials 77-82 , 15 ( 2005)
【10】 M. Surin, Ph. Lecl□re, R. Lazzaroni, J. D. Yuen, G. Wang, D. Moses, A. J. Heeger, S. Cho, and K. Lee “Relationship between the microscopic morphology and the charge transport properties in poly(3-hexylthiophene) field-effect transistors ” J. Appl. Phys. 100, 033712 (2006)
【11】 H. Sirringhaus, N. Tessler, R. H. Friend ”Integrated, high-mobility polymer field-effect transistors driving polymer light-emitting diodes” Synth. Met. 102, 857 (1999)
【12】 University of Potsdam Faculty of Mathematics and Natural Sciences Institute of Physics “http://www.uni-potsdam.de/u/physik/fprakti/anleiW5.pdf”
【13】 Brian A. Mattis ∗, Paul C. Chang, Vivek Subramanian“ Performance recovery and optimization of poly(3-hexylthiophene) transistors by thermal cycling ” Synthetic Metals 156 (2006) 1241–1248
【14】 Shinuk Cho, Kwanghee Lee, Jonathan Yuen, Guangming Wang, Daniel Moses, Alan J. Heeger, Mathieu Surin, and Roberto Lazzaroni “Thermal annealing-induced enhancement of the field-effect mobility of regioregular poly(3-hexylthiophene) films” J. Appl. Phys. 100, 114503 (2006)